[Ord. No. 793, § 1, 3-13-1978]
In any residential district, for any use permitted in such district, a building may be erected or altered on any unimproved lot held in single and separate ownership on the effective date of this ordinance which is not of the required minimum area or width, upon the granting of special exception by the Zoning Hearing Board, subject to the provisions of article XXI, section 2101.B.